Try this out: https://www-itechpost-com.cdn.ampproject.org/v/s/www.itechpost.com/amp/articles/105998/20210615/samsung-galaxy-s21-ultra-battery-drain-bug-discovered-possible-fixes.htm?amp_gsa=1&amp_js_v=a6&usqp=mq331AQKKAFQArABIIACAw%3D%3D#amp_tf=From...